sieve-rs 0.8.1

Sieve filter interpreter for Rust
Documentation 
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/*
 * SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
 *
 * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
 */

use crate::compiler::{
    CompileError, Value,
    grammar::{
        Capability,
        instruction::{CompilerState, Instruction},
    },
    lexer::{Token, word::Word},
};

#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(
    any(test, feature = "serde"),
    derive(serde::Serialize, serde::Deserialize)
)]
#[cfg_attr(
    feature = "rkyv",
    derive(rkyv::Serialize, rkyv::Deserialize, rkyv::Archive)
)]
pub(crate) struct Keep {
    pub flags: Box<[Value]>,
}

impl CompilerState<'_> {
    pub(crate) fn parse_keep(&mut self) -> Result<(), CompileError> {
        let cmd = Instruction::Keep(Box::new(Keep {
            flags: match self.tokens.peek().map(|r| r.map(|t| &t.token)) {
                Some(Ok(Token::Tag(Word::Flags))) => {
                    let token_info = self.tokens.next().unwrap().unwrap();
                    self.validate_argument(
                        0,
                        Capability::Imap4Flags.into(),
                        token_info.line_num,
                        token_info.line_pos,
                    )?;
                    self.parse_strings(false)?.into()
                }
                _ => Vec::new().into(),
            },
        }));
        self.instructions.push(cmd);
        Ok(())
    }
}